Abstract: A UPS tripping event caused by a mismatch between the protection settings of the main circuit breaker and the branch circuit breaker led to a thinking about the UPS short-circuit protection mode.Although time delay adjustment can alleviate skipping tripping to a certain extent, it is difficult for traditional protection mechanisms to fully ensure the stability of the system in the environment of high short-circuit current.Combined with case analysis and theoretical demonstration, the reasons for skipping trips under different tripping time settings are discussed in detail.In order to enhance the dynamic response ability and safety of the system, a technical scheme of anti-short-circuit skipping trip based on an adaptive quick-break protection module was proposed.